Tool-holder.



C. L. GOODRIUH.

TOOL HOLDER.

APPLIUATVION rum) APB. 1a, 190s.

92 1 ,977. Patented May 1s, 1909.

W56 ess es: [lave/war:

T L Wd/ich y/n'sdttorn ey, j 4 f d UNITED STATES -i'ATEisiT OEEICE.

eLmEN CE LEON coooiiicn, or HARTFORD, CONNECTICUT, AssIGN on To PRATT aWHITNEY COMPANY, or HARTFORD, CONNECTICUT, A UOETOEATIO'N or NEW JERSEY.

Toom-HOLDER.

Specification of Lettera Patent.

rammed nay is, reos.

. 'Appiieanon mea'aprii 1s, iene. i serial No. 312,426.

To allwhom it mtl/y concern: ,-.1 Beitknovm 4that I, .CLARENCE L. GOOD-111011,, citizen of the United States, residin .at Hartford, in thecounty of Hartford an 5..Sta.te of Connecticut, vhave invented certain'newand useful Im rovenients in Tool- Holders, of which the ol'lowing isespecifica- ,.ttion.- j v This linvention relates to devices for'lioldl,dies Vand taps, or other screw-cutting tools, and -isl the nature of animprove# rient on thev ool-holder covered byU. S.

Patent No. 803,981, dated January 2nd,

1906, and to which reference may be had.

15. Inaid patent, guides for permitting al vieldungmovement 1n a spiral,path of the device in which the tool islield are set forth, and thePresent invention comprises improveinei. ts

. m the construction of, and in the manner of .mounting saidl guides,whereby improved results alle obtained .Other improvements relate tomeans'car-I 'ried .by the tool-holder proper for engagingV e the uidesjust mentioned, and to means for causin'g the tool to engage the workunder yield' plaine In the accompanying drawings, Figure 1 is alongitudinal, vertical section of a. toolholder embodying the featuresof tlie'inven,

tion, saidsection bein takenon line 1,1 of 2. 2 is a si eelevation. Fig.3 a front end view; and Fig. 4 a section on line 4-4 .of iFig. 2; v Qn.,i Like numerals. designate similar parts `vthi-ou hout! the severalviews.

Refining to the drawings, the numeral designates a tubular shank`adapted to be received in the socket of a turret or other car- 110ATier, and 2 a head rigid with sii-id shank a'iid provided .with ears orprojections 3 and with Sockets 4 at its opposite ends. Clutchingguide-arms 5y are pivoted o ii bolts .6 passin through Vthe ears orrojections 3, and eac 4 5' rarmgproj ects beyond aid ears, andisprov-ided lwith an inclined side 6" and vvitli Va forward end inclinedat 7 for a .described A socket 8 is orinediin each arm 3 hack of itsivot, each socket being in alinement with tie. socket 4 of the head 2,and

`1tliese sockets 4are for the reception of coiled spnings 9 whichnormally force the guides 5 to -.the position illustrated in Fig.. 1 andagainst stop-pins 10, .passing -t ugh the ears; i f Y pressure, as willbe hereinafter eas-- urpose hereinafter Fitted in the bore of shank 1'and passing through the head 2-is the stem 11 of a dieor tap-holder 12provided with a socket 13 .in which the tool is secured by a screw 14,or other device l(see Fig. 3). This stein is ,piro vided With a chamber15, in which is placed a coiled spring 16, and at the .outer end .ofsaid s ring is a plunger 17 fui-cated at 1S to `strad le adpin 19`passin`through the rear end of' vsai stem, and t 'ough -a Collarf20 upon thereduc'ed rear end thereof. An iin"- lterna] thread 21 is formed in thetubular shank 1, and engaging said thread is a plug 2:2,grooved at 22 toreceive a screw-driver. Surrounding the'stem 1-1 and located within thetubular shank 1 is aV coiled-sprinU-QB, the Vinner head of which ahutsagainst the head .2, and its op osite end against the collar 2.0,

as illustratedpin Fig. 1.

As, shown byFigs. 1 and 4 the ste-iii 11 of liead'i12 is of cani-shapeas at 24. In'other Words, said stein is concentric for a ortioii of itsperiphery, and terminates ina s oulder 25, following which is a curve 26of less radius. Mounted in a boi-e of one of the ariiis 3 of the head 2is a plug 2.7, rabbeted at its top to foi-In a shoulder 28 with aninclined surface 29 to pernii t clearance, the end of the shoulder 28bei-ng in contact with the caIn- A shaped part of the steinll'. At itsend op- 85 posite the shoulder plug27 is rabbeted at 30 to rovide a seatfor the end .of a flat spring 31 lield to the arm byscrews 32, asillustrated in Fig-4, and serving to for/cetlieplug inward Whilepermitting it toyield'in an outward directa'on when the screw or otherobject luis been threaded and the holder rotates idlv with sadobject. In4the head1?, or toolholder proper, are seated )lugs 33, cach hsving r 1iinclined Wall 34 at its Outer 4end termina. .ig in a Hat surface 35, andeach also having' an Iinclined wall 36 .located substantially at rightangles tothe incline 34. Inthe operation of the improvement thetool-holder is advanced until the threadingtool engages the Work,carried -b the usual revolving chuck (not shown) um er yieldingpressure. On contact of the .tool with the WO1-k, the head 1,2 and itsstem 11 are foi-Led slightly backward, .the stem sliding over theful-cated plunger, 17 and compressing the spring 15, thuslcausmg -the.tool 'to make proper contact the work and avoid Iriarring or of thethread- .thereon at the cetof-theevatting-.action. When 1`10 thescrew-cutting tool engages the work the lead of the thread being cutcauses the toolclined wa ls of the arms 5 the tool-holder 12 will remainsubstantially stationary except as regards the slight rotary andlongitudinal movements mentionedpand that when the thread has beencompleted the plugsSS will leave the ends of the arms 5 and the head 12will rotate idly with the screw being formed. When this` action occurs,the tool-holder and its shank will rotate in the same direction as thechuci: carrying the work, and the camshaped ortion 24 of the stem willthen move b v the p ug 27, or to the right, as illustrated in F ig. 4,said plug snapping behind the shoulder 28 during4 such rotation. Whenthe thread of the Work has been completed a backward movement will beimparted to the turret slide, in the socket ofthe turret of which saidtool-holder is mountedkand the rotation of the work will also bereversed. When this action takes place the spring 23, which wascompressed by collar 20 during the forward movement of the tool-holdertoward the work, is free to expand and force the same bacluvard by itsaction against said collar 20, and the shoulders 25 and 28 of the stem11 and the plug 27 being in contact will prevent rotation of thetool-holder, and thus permit the rotary work-holder to withdraw thescrew from the threading-tool. It fre-- quently hap ens-in thecommonconstruction's that wlien the holder A12 starts to recede, contact willbe made with the endsl of the arms 5, thereby arresting the rearwardmovementof said holder and causing damage to the thread. To prevent thisaction the ends of the arms 5 are beveled or inclined as at '7, and theplugs 33 are also 'beveled or inclined as at 34, so that when theinclines meet on the.- return action ofr said tool-holder, the arms 5will be raised on theirpivots 6, against the stress ofthe springs 9,thus enabling the plu s to slip by them and avoiding all danger of thearrest of the movement of the retreatinv tool-holder. l

n thejillustration given the shank 1, its head and the inclined andpivoted guidearms carried by said head may be termed the stationarymember", while the tool-holder and. its stem may be designated as themovable member. It is obvious, however, that the relation of the partsmay be changed in various wag's without departure from theinvention. otoo while the means for holding the tool-holder under yieldingr pressurewhen the tool carried thereby engages the work are preferable, suchmeans may1 be variousiy modified without departure from the invention.

lt will be apparent from the foregoing description taken in connectionwith the annexed drawings that my tool holder comprises a tool-carryingmember and a head cooperative with each other each of said parts havinga projectionwhich projections cooperate to secure a coupling relationbetween said two parts on the advancing movement of said tool-carryingmember. One of these projections is yieldingly mounted radially of thetool holder and is en'gageabl'e by the other rojection on the backwardmovement of said) tool-carrying member during which action saidyieldable projection is caused to positively retract by the companionprojection so as to avoid injury to the parts as hereinbeore stated.While said projections are shown as du lieated this is not essential noris it essentialpon which part of the holder the yieldable projection orprojections be mounted although they are shown as carried bv the head ofthe im lement and consist of what l. have hereinbe ore termed guidearms. It is conceivable that in some cases the beveled tips oftheyieldable members might be `omitted although their presence is veryuseful. So also these beveled portions might be otherwise dis osedwithin 'the spirit of my invention the atter contemplating broadly amember which yields or is retracted on the back-` ward movement of thetool-carrying member.

Changes may be made in the form and proportions of the parts, and thevinclines on the )lugs and arms may be of various angles diflerefnt fromthse shown, if desired.

Other stop-devices may 4also `be provided as substitutes for thecam-shaped stein and plug without departure from the invention,

which is not limited to the precise details` illustrated and described.

Having tl'ius'described the invention what l claim is: j

1. A tool holder comprising a pair of members one of which has a forwardand backward movement with respect to the other, a swinging arm on oneof said members and a projection on t'he other member said projectionand swinging arm being cooperative to secure a working relation betweensaid members on the advancing movement of that one which moves forwardland bachward andsaid )rejection serving to swing said arm on the acwardmovement of said member which moves forward and backward.

2. A tool holder comprising a pair of` members one of which has aforward and backward movement with `respect to the companion member,'swinging arms on the latter member,. and deviceson the other member forengaging said swinging arms to secure a working relation between themembers on the advancing movement and to e'led surfaces on t swing` saidarms on the bacliw'ard movcltcnt ofV said mem'ber which moves forwardand backward.

3. A tool holder comprising a. tord-carrying member and a head thelormer having a forward and backward movement with respect to thelatter, a spring actuatedswing'- ingr arm on said head, a device on thetoolcarrylng member for englaoi'ine` said arm .on

the forward movement ot' sind tool-carrying member to secu-rc a workingrelation between said two irst-mentioned parts and said dex'ice serving'to engage and swing said arni on the backward movement. of saidtoolcarrj'ing member whereby said backward movement can be accomplished.without obstruction.

4.V A tool holder con ing,r member and a, h vieldingly carried by slat'erall)- beveled surta on .the tool-carrying m ing .capable offorward nd backward mov-ements with respect to s I d head and saidprojections bearing aainst said laterally beve forward move-ment of ad,swingingn arms 1d head and having es, and projections w saidtool-carrying member to thereb)v oper- 4land head and also p engaged bysai projections being said head; springs atively associate lsaid t3l-carrying member rniit tali-ning movement yof the fornter nd saidprojections :being adapted to eng` ge the tips of said swinging arms onthellreaiward movement of said tool-carrving member said tips wherebeveled- 5. The eombinationJwith a tool-carrying member having areeeslsed stem, of a plunger mounted in the recess of the stem; a springbearing againstl the rear end of the plunger; a support inl which thestem is mounted;l means for lpreventing `rotation between the stem andsup iort; and a device on the snppor't, and withrw ich the outer end ofthe plunger engages. i

46.I The combination, with a head having,r a tubular shank, oflever-arms pivoted to for normall)v holding said vrisine a tool-cari'tree ends; stops mber the latter be-4 vtheir ends at'lapted to engagethe lever-arms in position parallel to thc'hcad; a tool-holder having ustem mounted m the bore ol" tho head and shank; and inclined stopscarried by said tool-holder7 and in cn- `saeement with the lever-arms.

1. The combination, with ahead provided with pairs of separatedprojections, and chambers located in the ends of said head, oflever-arms pivoted between the j wrojections of the head, and recessedback of their pivots to receive springs; said springs; an incline on thetip o each lever-arm; a toolholdcr movable with relation to the bead;and inclined projections carried b v said toolholde-r. 4

S. The combination,with a head having a tubular shank, and-jnovided withseparated projections, of lever-arms pivoted between the projections andhaving inclined for limiting the movement of said lever-ar1ns;springsbearing against the lever-arms back ol' their pivots; a toolholderjhaving a stem fitted in thel tubular shank of the head; and plugscarried by said tool-holder,l and having inclined upper ends forengaging and swinging said leverarins. l

separated projections, of lever-arms pivoted between said projections,and each having an inclined forward end; yielding devices for engagingsaid lever-arms and head; stops for limiting the Swingin@ movement ofthe lever-arms; a tool-hol er movable with relation to the head; and,plugs carried bv said tool holder, and having inclines atA inclinedends of the lever-arms.

In testimonv whereof l allx my signature in presence o two witnesses, atHartford, Ct. this 24th day of March, 1906.

V(.ILARENGE LEON GOODRICH.

Witnesses l. F. GALYIN, R. T. GIFFORD.

9. The combination, with a head having`

